The present invention relates to a diagnostic method for the detection of small quantities of amniotic fluid in the vagina. 1 and 2 are perspective views of the container-lid assembly taken at different positions;. Various attributes such as polarity are associated with the edges and vertices, thereby creating an attributed relational graph, which is then searched for matches with a selected pattern considered to have hydrocarbon significance. Once the write process is complete, the on-media state of the file system is updated.